fix: prepare for commit views

Author: olafurpg

src/log.ts

@@ -4,15 +4,20 @@ const outputChannel = vscode.window.createOutputChannel('Sourcegraph')
 export const log = {
     // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
     error: (what: string, error?: any): void => {
-        const errorMessage =
-            error instanceof Error
-                ? ` ${error.message} ${error.stack || ''}`
-                : error !== undefined
-                ? ` ${JSON.stringify(error)}`
-                : ''
-        outputChannel.appendLine(`ERROR ${what}${errorMessage}`)
+        outputChannel.appendLine(`ERROR ${errorMessage(what, error)}`)
     },
     appendLine: (message: string): void => {
         outputChannel.appendLine(message)
     },
 }
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function errorMessage(what: string, error?: any): string {
+    const errorMessage =
+        error instanceof Error
+            ? ` ${error.message} ${error.stack || ''}`
+            : error !== undefined
+            ? ` ${JSON.stringify(error)}`
+            : ''
+    return what + errorMessage
+}

src/queries/treeCommitsQuery.ts

@@ -0,0 +1,60 @@
+import * as vscode from 'vscode'
+import { graphqlQuery } from './graphqlQuery'
+import gql from 'tagged-template-noop'
+import { log } from '../log'
+
+export async function treeCommitsQuery(
+    parameters: TreeCommitsParameters,
+    token: vscode.CancellationToken
+): Promise<string[]> {
+    const response = await graphqlQuery<TreeCommitsParameters, TreeCommitsResult>(
+        gql`
+            query TreeCommits($repositoryId: ID!, $revision: String!, $filePath: String, $first: Int) {
+                node(id: $repositoryId) {
+                    ... on Repository {
+                        commit(rev: $revision) {
+                            ancestors(first: $first, path: $filePath) {
+                                nodes {
+                                    ...GitCommitFields
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            fragment GitCommitFields on GitCommit {
+                oid
+            }
+        `,
+        parameters,
+        token
+    )
+
+    const result = response?.data?.node?.commit?.ancestors?.nodes?.flatMap(node => (node.oid ? [node.oid] : [])) || []
+    log.appendLine(`TREE_COMMITS ${JSON.stringify(result)}`)
+    return result
+}
+
+export interface TreeCommitsParameters {
+    repositoryId: string
+    revision: string
+    filePath: string
+    first: number
+}
+
+interface TreeCommitsResult {
+    data?: {
+        node?: {
+            commit?: {
+                ancestors?: {
+                    nodes?: TreeCommitNode[]
+                }
+            }
+        }
+    }
+}
+
+interface TreeCommitNode {
+    oid?: string
+}